Device for distributing dusting material



March 15, 1954 M. B. RAUSCH 2,672,347

DEVICE FOR DISTRIBUTING DUSTING MATERIAL Filed July 7, 1950 b F; If f 3! I "I" I "W II h. T

v I IINVENIOR: mRn/vJar/lowR/mmu Patented Mar. 16, 1954 bla ims Priority, app Germany July 18, 1949 v 2 "Claims.

Ih invention relates to a device 'fordistr'ib- 'utin'g material adapted to bespread out and more particularly to manure distributor provided 'yvith a portable or travelling centrifugal disc rotating around avertical to which the dusting jinaterial is fed from a storeta'nk arranged above. Such distributorsof dusting material are known e, g. as lime distributors, liquid manure spreaders and the like All these distributors have the disadvantage that the width of the strewed surface changes with the centrifugal speed and the weight of the dusting material. A uniform or a desired periodically unequal strewing of limited surfaces cannot be obtained ,v/ith such devices. V The invention ren ioves this disadvantage thereby that the centrifugal disc rotating in a horimetal a e ur oun ed alon its. n ir .9 cui'nf'erence by a reboundihgtvall arranged preferably vertically and reversing the dusting ma .i r a flun a a t t b he cen i a d c in a horizontal or nearly,horizontal plan fl0ln.,it flight path to the surface ,to be strewed, By this eb un g W h t tei ire ea is exactly limited The rebounding W11 may also h v he ha e .Q a canb ho d .1 i djon t e ipei. ide to avoid that .fi l' pu vrizi ddllstin rnatrial is upwardly s i o ai oneq tli pei hig m h i an g mate al to anti. a ai ij h. i n n' tt i. isqtia iti stolgpied initsfiight path and is reversed pref 'a ly wardly v l l A .f a ire Dime it r nt q iis oshape the rebounding wall so that it is comp ose d 'of two curved or arcuate portions intersecting each th i V r, in nto 93 a a q er; whe eby n el n ted s a e resu ts wh ch i g me r ca with res ct tow l ho t aii j ediwh se Qnsit dinal axis extends across thi direction of motion. if the rebounding wa surroundin'g the' centrifu; ga disc should be circular and,c'oncentricto the 1a iii e di i i 'e iimai ai ir 'i d. orm a diajni oi troughlike '61 ss-sct ion on th'e' surface to be strvved extending iiithe' direction of {no} tion. This darn would be the lowest in the iddl'e an ii e i t l as t e. iws d o ihe ri .i'q ei sw d ten h iri ei 1 equal distribution at t is dusting material, if a t re marl? iil i ian 9; F t et sz i j l i, 7.. 1 i i fi jf tributed absoi ely un orm yo r t e surface to h r w d: ii h ri qf raii n' q sa y t ive to therbounding Wall the ihentioii ed elongated shade, the acute 'cr's'ts formed the ends or the "2 t t longitudinal axis limiting the lateral edges 6 He surface to be strewed in the direction of m'ot n.

An exactly uniform distribution or the dust 2 material reversed from its, flight pathby bounding wall to the surface to be str sults preferably thereby that the, reboun receives equal quantities of. dusting m t'e'rial within the reach of equal sectors related to the center of the disc 'or limited by tangents of the disc.

If it is required to strevv e. g, a rooflike I which should be highest in the iniddlje of t surface to be streWed and, decrease unifornil toward the lateral edges ofs'aidsurfac acorrefsponding shape of the rebounding Wall 'rhaybf'e realized. It is of importance for all'inbodimnts of the idea of the invention that the q'usti' in 1- terial delivered by the centrifugal 'disc n the horizontal direction is. caught by a tt'otnaiiig wall surrounding the disc on allfsid's and is yeversed from its horizontal flight path tot'zard the surfaceto be strewed, a uniforin ora desired pt riodioally unequal distribution of the dusting inalterial on the urraceto be strewedr'esultingin each case from the shapeof the rebounding vkall. For. the purpose to improve the uniform tribution it is S itable toisupply they dustin ma terial to the centrifugal disc in a uniform. granu; lation and with uniform allotrnent. i Therefore, a grinding mill may be provided coaxially with the centrifugalvdisc between the store tank of {the dusting material and thecentrifugal disc. After being preliminar ly crushedini the store tank e. g. by worms Working in opposite 'dir'ectio nd fed into, the grinding mill the. dusting materialis ground between a rotating grinding cylinder and a stationary mill casing and transmitted to th e centrifugal disc angularly and concentrically e. g. over a conical grinding cylinder, In this way the centrifugal discis always charged on every point of its circurnference with equal n titles of dusting material oiuniform granula .The ra i' 'ShOWshYWav X mPl o e 43 1, 5 bodiment of the invention which now is to be described. I

,Eia s ato planv w of a di b tq f dusting material constructed according to the invention, a i Fig. 2 is a vertical transverse section through with steering knuckles. Naturally also other driving and supporting means may be used c. g. a three-wheel vehicle in which the strewing device is arranged between the leading wheel and the hind axle; in this case the width of the vehicle may be smaller in spite of a big surface to be strewed.

The centrifugal disc e is continuously charged with dusting material from a supply hopper a by means of feeding rolls b, c and is driven by the traversing wheels of the bogie wagon or by any other suitable means. According to the invention the centrifugal disc e is surrounded by a rebounding wall I which, in the shown embodiment, has a vertically arranged flange and a hood-like cover, preferably integral with said flange. The dusting material horizontally delivered from the centrifugal disc e is stopped in its flight path by the said rebounding wall f and reversed downwardly in a vertical direction onto the surface to be strewed.

For the purpose of a uniform distribution of the dusting material the rebounding wall has an elongated shape, the longitudinal axis being directed approximately across the direction of motion. The curvature of the rebounding wall is constructed in that way (Fig. 3) that the strip of the surface to be strewed is divided into zones by parallel lines i running in the direction of motion and that radial lines are drawn from the center of the disc e or, more suitable, tangential lines k are drawn from the circumference of the disc e, said radial or tangential lines including equal angles m. These lines correspond to the path in which the dusting material is strewed when leaving the disc e. The section points of the lines a and k are the points through which the theoretical curvature passes. As the dusting material does not leave the centrifugal disc 6 in a radial but in a tangential direction preferably the lines It run tangentially with respect to the circumference of the disc e. If the surface to be strewed should be covered with a uniform layer of dusting material the zone formed by the lines i are of an equal width. In Fig. 3 the entire circumference is divided into 24 equal angles so that the lines is form 24 sectors, and in the region of each of these sectors an equal quantity of dusting material is delivered at each time. The zones limited by the parallel lines 2', therefore, receive in front and behind in the direction of motion a charge of dusting material so that the number of zones is half the numbers of the angles. Consequently 12 longitudinal zones are provided corresponding to 24 angles of division. In combination with twelve angles of division six longitudinal zones and in combination with thirty-six angles eighteen longitudinal zones must be provided. As in such construction of the curvature between each two parallel lines 2', i. e. on each longitudinal zone an equal quantity of dusting material must be supplied, there is taken care for a uniform distribution of the dusting material over the entire width of the surface to be strewed provided the lines 2 have an equal distance from each other.

If an irregular distribution of the dusting material is desired it is only necessary to render the longitudinal zones of different widths, i. e., to draw the parallel lines 2' in a different distance from each other while the angles m remain equal, so that a certain equal quantity of dusting material is supplied to zones or strips of different width, the width of the single zones corresponding to the desired degree of irregular distribution. In that way practically every desired periodical form of distribution may be realized. Naturally the curvature of the rebounding wall 1 changes corresponding to the distances between the parallel lines 1c.

For reduction of the invention to practice, it sufilces generally to draw the lines of division 2' radially from the center of the disc e, as different experiments have shown, thereby simplifying the construction. A still usable shape may also be obtained even if the curvature is substituted by an approximate arc of circle.

Between the supply hopper a and the centrifugal disc e a grinding mill (1, d :1 may be provided coaxially with the disc. The dusting material is preliminarily crushed in the store tank by worm-like rolls b and c rotating in opposite direction and serving simultaneously as feeding rolls, and is then delivered into the grinding mill pulverizing it between the rotating grinding cylinder 01 and the stationary mill casing (F. The pulverized material is then supplied to the disc c annularly and concentrically to the axis of the said disc e over a frusto-conical projection al The quantity of dusting material may be controlled in a manner usual with distributors of dusting material by mechanically influencing the emciency of delivery of the rolls 1) and 0 provided within the store tank a or other suitable means. Naturally the feeding device as well as the centrifugal disc may be driven by the traversing wheels of the bogie wagon as known in connection with other distributors of dusting material.

Having now particularly described the nature of my invention and the manner .in which it is to be performed what I wish to have covered by Letters Patent is:

1. In a vehicle for the uniform distribution of spreadable materials, a traveling frame, a circular disc mounted upon said frame for revolution in a horizontal plane and for a peripheral distribution of said materials, means to feed the latter onto said disc, a stationary inverted cup-shaped bafile wall coaxially located above said revoluble disc, circumferentially surrounding the same and provided with a rim extending downwardly to a plane beneath said disc whereby an annular space is formed between the said rim and said disc, said baflie wall being composed of two oppositely located, equal semi-elliptical portions forming along their major axis opposite edges at their two intersecting faces, said axis connecting the two opposite edges extending substantially transversely at a right angle to the direction of movement of said vehicle.

2. In a vehicle for the uniform distribution of spreadable materials, a traveling frame, a circular disc mounted upon said frame for revolution in a horizontal plane and for a peripheral distribution of said materials, means to feed the latter onto said disc, a stationary inverted cup-shaped baffle wall coaxially located above said revoluble disc, circumferentially surrounding the same and provided with a rim extending downwardly to a plane beneath said disc whereby an annular space is formed between the said rim and said disc, said baflle wall being composed of two oppositely located, equal semi-elliptical portions forming along their major axis opposite edges at their two intersecting faces, said axis connecting the two opposite edges extending substantially transversely at a right angle to the direction of movement of said vehicle, the circumferential base line of said baffle wall connecting the points of intersection of consecutive tangents bordering on 5 said circular revoluble disc at equally spaced points and parallel lines equalling in number said tangents and equally distributed between the opposite edges of said baflle'wall.

MARTIN BERTHOLD RAUSCH.

References Cited in the file of this patent UNITED STATES PATENTS me Date 6 Name Date Mehlberger Dec. 5, 1911 Miks Apr. 23, 1912 Curtis Dec. 14, 1915 Bangert Sept. 9, 1924 Rush et al. Feb. 12, 1929 Crawford Mar. 8, 1949 Meincke Oct. 17, 1950 Weeks July 17, 1951 

